package com.heima.app.gateway.filter;

import com.heima.app.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request对象和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2. 判断是否是登录
        if(request.getURI().getPath().contains("login")){
            //放行
            return chain.filter(exchange);
        }

        //3.判断token是否存在
        String token = request.getHeaders().getFirst("token");
        if(StringUtils.isEmpty(token)){
            //返回401  权限不够
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //4.判断token是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            int result = AppJwtUtil.verifyToken(claimsBody);
            if(result == 1 || result == 2){
                //返回401  权限不够
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            //获得到用户id
            Object userId = claimsBody.get("id");

            //用户的id存入到header中,路由到各个微服务
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", userId + "");
            }).build();
            //重置request
            exchange.mutate().request(serverHttpRequest).build();

        }catch (Exception e){
            e.printStackTrace();
            //返回401  权限不够
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();

        }

        //5.放行
        return chain.filter(exchange);
    }

    /**
     * 优先级  值越小，优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
